How to use the cget.package.PackageBuild function in cget

def parse_pkg_build(self, pkg, start=None, no_recipe=False):
        if isinstance(pkg, PackageBuild): 
            pkg.pkg_src = self.parse_pkg_src(pkg.pkg_src, start, no_recipe)
            if pkg.pkg_src.recipe: pkg = self.from_recipe(pkg.pkg_src.recipe, pkg)
            if pkg.cmake: pkg.cmake = find_cmake(pkg.cmake, start)
            return pkg
        else:
            pkg_src = self.parse_pkg_src(pkg, start, no_recipe)
            if pkg_src.recipe: return self.from_recipe(pkg_src.recipe, pkg_src.name)
            else: return PackageBuild(pkg_src)

def parse_pkg_build_tokens(args):
    parser = argparse.ArgumentParser()
    parser.add_argument('pkg_src', nargs='?')
    parser.add_argument('-D', '--define', action='append', default=[])
    parser.add_argument('-H', '--hash')
    parser.add_argument('-X', '--cmake')
    parser.add_argument('-f', '--file')
    parser.add_argument('-t', '--test', action='store_true')
    parser.add_argument('-b', '--build', action='store_true')
    return parser.parse_args(args=args, namespace=PackageBuild())

def parse_pkg_src(self, pkg, start=None, no_recipe=False):
        if isinstance(pkg, PackageSource): return pkg
        if isinstance(pkg, PackageBuild): return self.parse_pkg_src(pkg.pkg_src, start)
        name, url = parse_alias(pkg)
        self.log('parse_pkg_src:', name, url, pkg)
        if '://' not in url:
            return self.parse_src_file(name, url, start) or \
                (None if no_recipe else self.parse_src_recipe(name, url)) or \
                self.parse_src_github(name, url)
        return PackageSource(name=name, url=url)

def parse_pkg_build(self, pkg, start=None, no_recipe=False):
        if isinstance(pkg, PackageBuild): 
            pkg.pkg_src = self.parse_pkg_src(pkg.pkg_src, start, no_recipe)
            if pkg.pkg_src.recipe: pkg = self.from_recipe(pkg.pkg_src.recipe, pkg)
            if pkg.cmake: pkg.cmake = find_cmake(pkg.cmake, start)
            return pkg
        else:
            pkg_src = self.parse_pkg_src(pkg, start, no_recipe)
            if pkg_src.recipe: return self.from_recipe(pkg_src.recipe, pkg_src.name)
            else: return PackageBuild(pkg_src)